CVE-2026-64599

In the Linux kernel, the following vulnerability has been resolved:

crypto: amlogic - avoid double cleanup in meson_crypto_probe()

When meson_allocate_chanlist() fails after a partial allocation, it already unwinds the allocated chanlist state through its local error path. meson_crypto_probe() then jump to error_flow and calls meson_free_chanlist() again, causing the same per-flow resources to be torn down twice. In the reproduced failure path, the second teardown re-entered crypto_engine_exit() on an already destroyed worker and KASAN reported a slab-use-after-free in kthread_destroy_worker().

Prevent double-free by handling partial allocation failures locally within meson_allocate_chanlist() and skipping the outer cleanup path.

The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available.

The bug was reproduced in a QEMU x86_64 guest booted with KASAN on v7.1, using the reproducer under tools/testing/meson_crypto_probe. The reproducer forces the second dma_alloc_attrs() call in the gxl-crypto probe path to return NULL, making meson_allocate_chanlist() fail after partial initialization. On the unpatched kernel this reliably triggered a slab-use-after-free. With this fix applied, the same reproducer no longer emits any KASAN report and the probe fails cleanly with -ENOMEM.

==================================================================
BUG: KASAN: slab-use-after-free in kthread_destroy_worker+0xb2/0xd0
Read of size 8 at addr ff1100010c057a68 by task insmod/265

CPU: 1 UID: 0 PID: 265 Comm: insmod Tainted: G           O        7.1.0-rc2-00376-g810af9adc907-dirty #10 PREEMPT(lazy)
Tainted: [O]=OOT_MODULE
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x68/0xa0
 print_report+0xcb/0x5e0
 ? __virt_addr_valid+0x21d/0x3f0
 ? kthread_destroy_worker+0xb2/0xd0
 ? kthread_destroy_worker+0xb2/0xd0
 kasan_report+0xca/0x100
 ? kthread_destroy_worker+0xb2/0xd0
 kthread_destroy_worker+0xb2/0xd0
 meson_crypto_probe+0x4d0/0xc10 [amlogic_gxl_crypto]
 platform_probe+0x99/0x140
 really_probe+0x1c6/0x6a0
 ? __pfx___device_attach_driver+0x10/0x10
 __driver_probe_device+0x248/0x310
 ? acpi_driver_match_device+0xb0/0x100
 driver_probe_device+0x48/0x210
 ? __pfx___device_attach_driver+0x10/0x10
 __device_attach_driver+0x160/0x320
 bus_for_each_drv+0x104/0x190
 ? __pfx_bus_for_each_drv+0x10/0x10
 ? _raw_spin_unlock_irqrestore+0x2c/0x50
 __device_attach+0x19d/0x3b0
 ? __pfx___device_attach+0x10/0x10
 ? do_raw_spin_unlock+0x53/0x220
 device_initial_probe+0x78/0xa0
 bus_probe_device+0x5b/0x130
 device_add+0xcfd/0x1430
 ? __pfx_device_add+0x10/0x10
 ? insert_resource+0x34/0x50
 ? lock_release+0xc9/0x290
 platform_device_add+0x24e/0x590
 ? __pfx_meson_crypto_probe_repro_init+0x10/0x10 [meson_crypto_probe_repro]
 meson_crypto_probe_repro_init+0x330/0xff0 [meson_crypto_probe_repro]
 do_one_initcall+0xc0/0x450
 ? __pfx_do_one_initcall+0x10/0x10
 ? _raw_spin_unlock_irqrestore+0x2c/0x50
 ? __create_object+0x59/0x80
 ? kasan_unpoison+0x27/0x60
 do_init_module+0x27b/0x7d0
 ? __pfx_do_init_module+0x10/0x10
 ? kasan_quarantine_put+0x84/0x1d0
 ? kfree+0x32c/0x510
 ? load_module+0x561e/0x5ff0
 load_module+0x54fe/0x5ff0
 ? __pfx_load_module+0x10/0x10
 ? security_file_permission+0x20/0x40
 ? kernel_read_file+0x23d/0x6e0
 ? mmap_region+0x235/0x4a0
 ? __pfx_kernel_read_file+0x10/0x10
 ? __file_has_perm+0x2c0/0x3e0
 init_module_from_file+0x158/0x180
 ? __pfx_init_module_from_file+0x10/0x10
 ? __lock_acquire+0x45a/0x1ba0
 ? idempotent_init_module+0x315/0x610
 ? lock_release+0xc9/0x290
 ? lock

—truncated—

Affected Software

References

• https://git.kernel.org/stable/c/5b452019a4127f63c1f2147237fc287d1581f606
• https://git.kernel.org/stable/c/6d827ade51a24e18d81afb9f32756d339520a14c
• https://git.kernel.org/stable/c/6dda8406d8a3da2519c8b388d443d7357839cb63
• https://git.kernel.org/stable/c/6effdbaca3cd8354540bdf42c7f5fb84412afeb7
• https://git.kernel.org/stable/c/84a00be9b736aa5dce902a290f62cbbbdcfab9ed
• https://git.kernel.org/stable/c/c2c48aa7a6be36d4c93da75d14d4b4f2f4168c81
• https://git.kernel.org/stable/c/c80360b4e85099fc3835378a96a59c0a2480fb07
• https://git.kernel.org/stable/c/f30e2b879bda14bc3e1524fba6f8ab9ec119da90